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TypeError [ERR_INVALID_CALLBACK]: Callback must be a function. Received undefined
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Last Updated: August 11, 2026
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![Verified TypeError [ERROR_INVALID_CALLBACK]: callback must be a function || solved Dev Index](https://i.ytimg.com/vi/N56ZKId-eNg/mqdefault.jpg)
![TypeError [ERR_INVALID_CALLBACK]: Callback must be a function. Received undefined](https://i.ytimg.com/vi/KUH8iXEtyCY/mqdefault.jpg)
![NodeJS : Error: .post() requires callback functions but got a [object Undefined] not working](https://i.ytimg.com/vi/RPpay5ufnec/mqdefault.jpg)
![[Node.js] 024 - Handling callback errors](https://i.ytimg.com/vi/QPryrtxsPSc/mqdefault.jpg)
